Question about BenQ Joybook 8000 Notebook

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The display suddenly turns very dark while working or on restart. When I restart again it becomes normal. Please help solve the problem.

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This is generally an indication that the screen inverter is going out, and it could be the screen itself. You will need to have a tach test it to be sure it's the inverter and not the screen.

Posted on Jul 09, 2008

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I have lenovo g550...my screen flickers in every 5minutes...


Failing Inverter An inverter, typically found inside a laptop computer, consists of a small board, which has impregnated electronic circuits stamped on it. Inverters look like thin boards about the of two sticks of chewing gum. The inverter and its bulb control the intensity of the liquid crystal display, which lights the screen monitor. The computer can control the output voltage of the inverter and either lighten or darken the screen. A special type of inverter can adjust the brightness of the screen by using an internal sensor to judge the room brightness, and then adjust the screen accordingly. Failing inverters give off some specific warning signs, which can be recognized by observing different screen characteristics.

Short Intermittent Display Upon turning on the laptop, the screen flashes on in the normal mode for a short period and then blinks to black. A very faint image appears in a dark background, which will be very hard to see almost invisible. After shutting off the laptop and restarting, the same mode occurs, where the screen appears normal for a few seconds then fades to black. This condition points to a failed inverter. To confirm this, plug in an operational external monitor; if the external monitor functions, the inverter has failed. b> Total Blackout with Ghost image b> The laptop turns on, as indicated by the power supply button, but the screen comes up black. The screen comes up black after restart. You might be able to detect a very dim or ghost-like image on the monitor. When you plug in a known functioning external monitor, the external monitor operates normally. This mode of display indicates a failed inverter. b> Long Term Periodic Operation b> With this failure mode, the laptop screen illuminates normally upon start-up and remains that way after several minutes, hours or even days, until it goes very dark again. Brightness controls or restoration attempts do not work. Most often, the screen will function normally with a computer restart, but will eventually return to black. Faint ghost images might appear, as seen in the total blackout mode. b> Dark With Color Variation b> Upon computer start-up, the monitor shows black or dark gray, accompanied by very faint images. The screen might have an intermittent color change, or remain on with a non-standard color variation, like pink or red. b> Auto Control Switch b> If the screen appears black, with no faint or ghost images, look for the lid switch near the back hinge. The switch, when depressed with a closed lid, shuts off the computer and monitor functions. Sometimes the switch becomes stuck in the closed position, disallowing the computer and monitor to turn on when opened. Pushing the switch manually several times can often free it up. If the switch tab has broken or jammed inside the case, it needs replacing. b> Loose Connection In this mode, the display looks normal upon start-up, but tapping the side case of the computer turns the screen black. More tapping results in the screen functioning normally then cutting out again. This condition points to a loose wire connection from the inverter to the LCD backlight lamp, or the video cable. The connectors can be accessed by removing the monitor bezel screws and pulling the plastic retainer off. Both connectors can be cleaned and refitted.

Feb 10, 2013 | Lenovo G550 PC Notebook

1 Answer

Hi, I have acer aspire 5520,2 Gb RAM... When I turn on my acer,everithing works just fine,exept monitor,it remains black,When I try ecternal monitor,it works fine,windows wors fine to,everithing but the...


Aspire 5520 has LCD Display. The screen displays becomes dark/ dim if there is no backlight.
There are two parts responsible for lighting the display. First is the CCFL (Cold Cathode Florecent Lamp), which is the back light and the second is the Inverter board, which provides high voltage to the CCFL. These parts are inside the LCD screen. Either of the parts may be faulty or in some rare cases both. Also, the video data cable may be loose or faulty, which can be identified only after opening the top cover.
So, my advice is that you get it properly checked by any professional for replacement of Inverter or CCFL.

Hope it helps! Good Luck! Thanks for using Fixya!
CreativeTECH

Jun 22, 2011 | Acer Aspire 5520-5579 Notebook

2 Answers

Display suddenly becomes pixelated or fuzzy


just goto mycomputer then right click select properties
display setting adjust the bit of the color make it 32 bit

or if your O.S vista just right click on the desktop click personaliza display setting. change the color into 32bit .

Mar 05, 2010 | Dell Vostro 1310 Notebook

1 Answer

My screen is too dark. I pressed ''video playback'' on the tool bar and now my screen is dark. Any help?


Hi there, please restart your laptop when its booting press F8 key . You will find few option asking for selection. Select that by using up/down arrow key. Select " Last know good configuration" & press Enter. Next page asking for selecting operating system, for example: windows vista or Windows XP etc. Just select the operating system & press Enter again. ( Hope your laptop showing only one operating system ). Your laptop will start normally. After the if you seen the screen dark then press FN+Right arrow in key board(>). When you press FN + ( < ) or ( >) key that's time its working for brightness controlling for screen. Now if all well then fine other wise please let me know .
Another suggestion is run your Acer driver DVD for installing Display drivers. When finish restart your laptop and watch whats going. If no success then format the Operating system & reinstall again.

Thanks & waiting for your feedback.

Feb 06, 2010 | Acer Aspire 5536-5224 Notebook

1 Answer

Black screen display after switching on


Try restarting without the battery ...just the power adapter.

May 22, 2009 | Dell Inspiron 5150 Notebook

1 Answer

The mouse cursor moving itself


Tach pad is clean and set the tachpad speed in contorl panal
speed is select slow and save in laptop ......................after check 95 % your problem is solve

Mar 30, 2009 | Dell Latitude D600 Notebook

1 Answer

Collapse in graphical view and hang!


You say you replaced the graphics card?
Either way, this is one of two things. Hardware (a faulty display card) or drivers. If it is an old card, or you did a driver update recently, go to your device manager, and roll back to your previous drivers. if this doesn't solve the problem I recommend getting the latest drivers for your display card, installing them and seeing what happens.

Hope this solves your problem!

Jan 07, 2009 | Dell Latitude D630 Notebook

1 Answer

Compaq presario laptop display problem


Use system restore to bring back the computer to a date before the one you started to have troubles with the screen. After this you may need to reinstall display drivers, as you installed an older version after getting in troubles.

cheers

Feb 14, 2008 | PC Laptops

2 Answers

Display problem.


reinstal the os and reformat yur harddisk

Oct 29, 2007 | Acer Aspire 5500 5570-2609 Laptop

1 Answer

Display


A really dim display like you're describing is most likely a backlight problem.  If your inverter went bad you wouldn't have any display at all.  you need to get your backlight changed.

Oct 10, 2007 | Acer Aspire 5002WLMi Notebook

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